Tools: hv: check return value of system in hv_kvp_daemon

hv_kvp_daemon.c: In function 'main':
hv_kvp_daemon.c:1441:8: warning: ignoring return value of 'daemon', declared with attribute warn_unused_result [-Wunused-result]
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/hv/hv_kvp_daemon.c

@@ -1353,7 +1353,11 @@ static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
 	 */
 
 	snprintf(cmd, sizeof(cmd), "%s %s", "hv_set_ifconfig", if_file);
-	system(cmd);
+	if (system(cmd)) {
+		syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
+				cmd, errno, strerror(errno));
+		return HV_E_FAIL;
+	}
 	return 0;
 
 setval_error: